Illinois State Archives Research:
Illinois *State* Censuses were taken for some or all counties in IL.
All censuses available at the Illinois State Archives.
Guidelines for research at the Illinois State Archives.
Illinois State Archives Census Records Group
Census Online Sites - Many online censuses from all over the United States:
Censuses online at the USGenWeb Archives Census Project
Censuses online at the USGenWeb Census Project
Enumerator instructions for the 1850 thru 1950 censuses at the Minnesota Population Center, University of Minnesota site
Free maillists for Illinois Census Lookups:
Join one of the below by sending a new message to the address and only putting the word subscribe in the body of the message.
Surname to Soundex Code site
Nonpopulation Schedules (Just what are they and where to find)
Epidemics - types and years
THIS AND THAT GENEALOGY TIPS ON DISEASES, MEDICAL TERMS, EPIDEMICS by Shirley Hornbeck
Old Time Medical Terms at Lori's site - a list of old medical terms with modern meanings.
Epidemics - a link at Lori's site - will help you understand why your family moved.
Cyndi's List - US Census sites
US Census Bureau site
Deciphering Occupation Codes Appended to the 1930 Census in One Step
NONPOPULATION SCHEDULES INFORMATION
From Tom Bunt:
I just read in the July/August issue of the "National Genealogy Society Newsletter" an article by Claire Prechtel-Kluskens, Director of NGS called "The Nonpopulation Census Schedules: Part 1, Agriculture and Manufacturing Schedules."
Here's the essence:
For the years 1850, 1860, 1870, 1880 there's an additional schedule of information about farms: name of owner, manager, acres, cash value, horses, cows, mules, etc. The amount of oats, tobacco, cotton, etc. produced. (In 1850 farms that produced less than $100 worth of products were not included.)
For 1820, 1850, and 1860 the manufacturing schedule reported the type of business or product, amount of capital, value of raw materials, etc. (Manufacturing operations producing less than $500 worth of goods were not included.)
So, if your ancestor was on a farm, you can find out what they grew, how much, if they were making any money (or why they moved from the acres that didn't grow anything).
The census is available from American Genealogical Library or the Church of Jesus Christ of Latter day Saints or the National Archives, etc.
County main page